JP3075604B2 - Gusset bag for keeping freshness of blue ume and freshness - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for maintaining freshness of blue plum and a gusset bag for maintaining freshness.

[0002]

2. Description of the Related Art Blue plums rapidly decrease in freshness after harvesting, and when they are shipped at a temperature of about 20 to 25 ° C. in June, yellowing progresses rapidly 3 to 4 days after harvesting, lowering their commercial value. . For this reason, in particular, when transporting to a remote place, it is necessary to devise measures to suppress yellowing in order to maintain commercial value.

[0003] Conventional techniques for maintaining the freshness of blue ume include use of low temperatures and removal of generated ethylene gas, which is known to suppress yellowing. Alternatively, it is also known that the freshness holding period is extended by so-called MA storage, in which the inside of the package is kept at a low oxygen and high carbon dioxide concentration by utilizing the respiratory action of the film-sealed package and blue ume.

[0004] However, the current method is:
Most of them are distributed at room temperature by putting 10 kg of blue ume in a cardboard box, and only a part of MA is stored in polyethylene, ethylene / vinyl acetate copolymer, polybutadiene film or the like. These films are often used as inner bags in cardboard boxes at the stage of distribution from the production center to the market, and are used in a sealed or folded form to obtain the MA effect. Also, in recent years, in consideration of shelf holding at retail stores such as supermarkets, in many cases, it is often sold to consumers as it is, divided into small portions, wrapped in small quantities, and in this case, an appropriate oxygen permeability in order to obtain the MA effect. It is practically used for packaging, such as leek packaging, with a small amount of hermetically sealed film.

[0005]

SUMMARY OF THE INVENTION Among the above prior arts,
The use of low temperatures is most effective for maintaining the freshness of green plums, but has the disadvantage that the costs for low temperature distribution are too high. Further, there is a problem that the effect of removing generated ethylene gas may or may not be obtained depending on the composition of the environmental gas, that is, the concentration of oxygen and carbon dioxide in the atmosphere. Furthermore, in the case of MA storage by film, it is very difficult to control the gas concentration in the packaging bag because the oxygen concentration and carbon dioxide concentration in the system depend on the respiratory action of agricultural products and the gas permeability of the film. There is a problem. In the case of blue ume, the oxygen concentration in the packaging bag is 0.1%.
If it is less than 0.2%, respiratory disorders occur, and brown disorders occur.

At present, the most common retail form at the consumption stage is about 1 kg, and according to experiments by the present inventors, in this case, 2 kg is used.
Oxygen permeability per pouch at 3 ° C is from 1,800 to 2.5
If it is sealed and packaged with a pouch of about 00 cc / 24 hr · atm and used together with an ethylene remover, freshness can be maintained for about 7 days at room temperature. Examples of a film forming such a pouch include a polyethylene film, an ethylene / vinyl acetate copolymer film, a polybutadiene film, and the like. By controlling the thickness of these films, the oxygen permeability per pouch at 23 ° C. is 1,800. ~
2,500 cc / 24 hr.atm was obtained, and it was possible to obtain optimum oxygen and carbon dioxide gas concentration conditions for blue ume.

However, at present, the form of shipment from the production area is usually transported at room temperature in a 10 kg cardboard box. When similar sealed packaging is performed using the above-mentioned film, the respiration rate of blue plum is large. Too much, the oxygen concentration in the packaging bag becomes 0.2% or less, causing respiratory disorder and brown disorder. According to the experiments of the present inventors, when a 10 kg film-sealed package of blue plum is made at room temperature, the oxygen permeability per pouch of the used pouch at 23 ° C. is 10,000 to 100.
0,000cc / 24hr · atm is required. It is possible to improve the oxygen permeability per pouch by reducing the thickness of the film or increasing the area by increasing the pouch size, but obtain a film strength that can withstand the weight of 10 kg of blue plum For this purpose, a film thickness of at least 20 .mu. Is necessary, and it is impossible with conventional films to obtain an oxygen permeability per pouch of 10,000 to 100,000 cc / 24 hr.atm at 23.degree. In addition, when the pouch size is increased, extra space other than blue plums is increased, which is inconvenient to handle and disadvantageous in cost of the pouch. For this reason, M
A storage was very difficult.

Further, most of the conventional bags are in the form of flat pouches, and have the drawback that the workability of mounting the pouches is extremely poor especially when used as a cardboard inner bag in a production area. The present invention solves the above-mentioned problems of the prior art,
It is an object of the present invention to provide the most effective method for maintaining freshness of blue plum and a gusset bag for maintaining freshness used therein.

[0009]

The present inventors have conducted intensive studies to solve the above problems, and as a result, the oxygen permeability per pouch at 23 ° C. was 10,000 to 100,000 cc / 24 hr · atm.
By packaging blue plums in a pouch and enclosing and storing an ethylene-removing agent, MA storage and ethylene-removing effects are simultaneously achieved at room temperature, and the freshness preservation period of blue plums is greatly extended compared to the past. The inventors have found that the present invention has been completed.

That is, according to the present invention, (1) the pouch is composed of a folded part (1) and a body part (2).
Non-woven fabric whose folded part (1) can be heat-sealed at low temperature
It consists of a sheet laminated with a thermoplastic resin on top, and has an oxygen permeability at 23 ° C of 10,000 to 100,000 cc / 2 per pouch.
Packaging the blue plums in pouch is 4hr · atm, blue plum method of freshness, characterized by storing the ethylene removing agent at room temperature enclosed sealed thereto, the total surface of (2) pouches, at a low temperature The method for maintaining freshness of blue plum according to the above (1), which is formed of a sheet obtained by laminating a thermoplastic resin on a heat-sealable nonwoven fabric, (3) wherein the thermoplastic resin is polymethylpentene
(1) or the method of maintaining freshness of blue plum according to (2), (4) The ethylene remover is a carbonaceous molecular sieve having 4 to 6Å micropores adsorbed bromine (1), (2) Or
(3) the method of maintaining the freshness of blue plum according to (5) the above (1), wherein the green plum to be packaged is 10 kg
(2), (3) or (4), the method for maintaining freshness of blue plum. (6) is composed of folding section (1) and the barrel (2), folding unit (1) is made polymethylpentene from laminated sheet on a heat-sealable non-woven fabric at low temperature, per pouch at 23 ° C. Oxygen permeability is 10,000-100,000cc / 24h
The gist of the present invention is a gusset bag for maintaining freshness of blue plum, which is characterized by r · atm.

[0011]

The structure and operation of the present invention will be described. The pouch used in the present invention may be a pouch having an oxygen permeability at 23 ° C. per pouch of 10,000 to 100,000 cc / 24 hr · atm. As such a pouch, the whole or a part of the pouch may be at a low temperature. And a pouch which is a film in which polymethylpentene is laminated on a nonwoven fabric which can be heat-sealed.

Polymethylpentene is a kind of stereoregular polyolefin and is a polymer having 4-methylpentene-1 as a monomer. Oxygen permeability is the highest among olefin-based thermoplastic resins, and by controlling the thickness of lamination, the oxygen permeability at 23 ° C. required for the present invention of 15,000 cc / m ² · 24 hr · atm or more can be obtained. It is possible. However, the polymethylpentene film alone has no heat-sealing property and is difficult to use in a pouch form, but can be used in a pouch form by laminating with a nonwoven fabric that can be heat-sealed at a low temperature. in this case,
Since the inner surface of the pouch is a non-woven fabric surface that can be heat-sealed at a low temperature and the outer surface is polymethylpentene, it can be bonded by ordinary heat sealing without using impulse seal,
Continuous production using a gusset bag making machine is possible.

The lamination of polymethylpentene on the nonwoven fabric can be performed by extruding the polymethylpentene onto the nonwoven fabric by using a conventionally known T-die method. This is only caused by entanglement, and a sufficient adhesive force can be obtained by itself, but if necessary, corona treatment and ozone treatment can be used together.

Further, the pouch used in the present invention exhibits its effect in a sealed state, so that a nonwoven fabric having a low-temperature and heat-sealing property is required on the inner surface. Desirable is a nonwoven fabric made of polypropylene fiber or a nonwoven fabric made of polyester / polyethylene fiber, nylon / polyethylene fiber, polypropylene / polyethylene fiber, polyester / polypropylene fiber, nylon / polypropylene fiber having a core-sheath structure, for example, an olefin manufactured by Unitika Ltd. Elves (registered trademark), which is a system-based spunbond nonwoven fabric, or Syntex (registered trademark), which is an olefin-based spunbond nonwoven fabric manufactured by Mitsui Petrochemical Co., Ltd. can be used.

In the present invention, in order to exhibit the effect of MA storage, the oxygen concentration in the pouch must be 0.3% or more and 5% or less.
The oxygen permeability at 23 ° C. per pouch required for this may be 10,000 to 100,000 cc.
/ 24hr · atm, more preferably 20,000-50,000cc
/24hr.atm is desirable. If the oxygen permeability at 23 ° C. per pouch is less than 10,000 cc / 24 hr · atm, the oxygen concentration in the pouch will be 0.2% or less, and the brown plum will have a brown hindrance and an off-flavor. Also, 100,000cc / 24h
At an oxygen permeability of r · atm or more, the effect of MA storage is not recognized, and the progress of yellowing cannot be suppressed. The oxygen permeability per pouch can be controlled by changing the thickness of the laminated polymethylpentene, but can also be controlled by changing the area of the packaging material in which the polymethylpentene is laminated on the nonwoven fabric. For example, it is possible to freely change the oxygen permeability per pouch by using a packaging material in which a thermoplastic resin such as polyethylene / polypropylene is laminated on one side and a non-woven fabric is laminated with polymethylpentene on one side. It is possible to obtain an oxygen permeability of 10,000 to 100,000 cc / 24 hr · atm. In addition, by adopting such a form, there is a double effect that the disadvantage that the contents cannot be seen is solved.

A particularly preferred gusset bag for maintaining freshness is a gusset bag comprising a folded portion and a body 2 as shown in FIG. The folded part 1 is composed of a sheet in which polymethylpentene is laminated on a nonwoven fabric that can be heat-sealed at a low temperature,
The thickness of the polymethylpentene to be laminated can be controlled. In the gusset bag of the present invention, the oxygen permeability of the folded portion is remarkably larger than that of the trunk portion, so the oxygen permeability of the entire pouch is determined by the area of the folded portion and the thickness of the polymethylpentene laminated on the folded portion. You.

The body 2 can be made of any ordinary thermoplastic resin, but in consideration of the fact that it can be continuously produced by a gusset bag making machine, it is desirable that the body 2 be made of a film that can be continuously heat-sealed. Examples of such a film include nylon / polyethylene, polyester / unstretched polypropylene, stretched polypropylene / unstretched polypropylene, and the like, and a multilayer film composed of a substrate / sealant is desirable.

As a result, normal heat sealing can be performed with a gusset bag making machine, and continuous production can be performed, thereby improving the productivity. Further, since the oxygen permeability of the body 2 is extremely small as compared with the folded portion 1, the structure and thickness of the base material / sealant of the body 2 hardly affect the oxygen permeability of the entire pouch. Is not limited in terms of oxygen permeability. The gusset bag of the present invention further has the following effects. That is, when trying to achieve the same oxygen permeability as the present invention with a normal flat pouch,
One side of the pouch is a normal thermoplastic resin and is transparent, but the other side is opaque with a packaging material in which a non-woven fabric is laminated with polymethylpentene, and has the disadvantage that the contents are difficult to see as a whole. However, in the present invention, the opaque portion is limited to only the portion of the folded portion 1, so that the effect that the contents are easy to see is obtained.

In the present invention, the MA in a film sealed package is used.
In addition to the effect of storage, the addition of an ethylene gas remover can further enhance the freshness retention effect of blue plum. As a result, ethylene gas, which is an aging-promoting hormone for fruits, is sequentially removed and does not accumulate in the pouch. As a result, it is possible to significantly reduce the occurrence of brown damage of blue plum and the damage after opening.

As the ethylene gas remover, a mixture of potassium permanganate in a porous material such as activated carbon, zeolite, or zeolite, or sodium bromate or potassium bromate is dissolved, and acidic water is added to the activated carbon to react. It is possible to use a small bag type ethylene remover such as a dried product or a carbonaceous molecular sieve having 4 to 6 mm micropores to which bromine is adsorbed. However, bromine is removed from the ethylene removal rate and safety during use. It is desirable to use the adsorbed carbonaceous molecular sieve having 4 to 6 micropores in the form of a pouch. In addition, the amount of the ethylene remover can be arbitrarily adjusted according to the amount of blue ume to be stored, and is not particularly limited.

[0021]

Next, the present invention will be described more specifically with reference to examples and comparative examples.

[0022]

Example 1 (1) Using a conventionally known T-die method, polymethylpentene (MX-021 manufactured by Mitsui Petrochemical) was coated on a nonwoven fabric (Unitika Elves (registered trademark) S0303WDO 30 g / m ² ) at a thickness of 40 μm. Extrusion gave a laminated film of the present invention. (2) Linear low-density polyethylene (Mooretec 0238N manufactured by Idemitsu Petrochemical) was formed into a film by an inflation method to obtain a film having a thickness of 30 μm. (3) A gusset pouch of 400 × 700 mm was prepared using the film of (1) on one side and the film of (2) on one side to obtain a pouch of the present invention ((1) a partial area of 0.77 m ² , (2) ) Partial area
0.28m ² , total pouch area 1.05m ² ). (4) Add 10 kg of blue plum and a small bag type ethylene remover (20 g of bromine adsorption activated carbon manufactured by Takeda Pharmaceutical) to this pouch.
And the opening is sealed with a rubber band stopper.
Saved for days. Comparative Example 1 10 kg of blue ume was enclosed in the same pouch as in Example 1, the opening was sealed with a rubber band stopper, and stored at 23 ° C. for 5 days.

Comparative Example 2 (1) Linear low-density polyethylene (Mooretec 0238N manufactured by Idemitsu Petrochemical) was formed into a film by an inflation method to obtain a film having a thickness of 30 μm. (2) A gusset pouch of 400 × 700 mm was made from the film on both sides (1). (3) 10 kg of blue plum and 10 sachet-type ethylene remover (20 g of bromine-adsorbed activated carbon manufactured by Takeda Pharmaceutical Co., Ltd.)
And the opening is sealed with a rubber band stopper.
Saved for days. Comparative Example 3 10 kg of blue plums were put in a cardboard box and left unpacked at 23 ° C.
For 5 days.

Test Example 1 Table 1 shows the results of measuring the oxygen permeability per pouch of the pouches of Example 1 and Comparative Example 2. As is clear from these results, the pouch of Example 1 has higher oxygen permeability than Comparative Example 2.

[0025]

[Table 1]

Test Example 2 For Example 1 and Comparative Example, the results of measuring the internal gas composition for 3 days and 5 days are shown in Table 2, and the results of the appearance inspection on the 5th day are shown in Table 3. As is clear from Tables 2 and 3, in Example 1, the oxygen concentration in the pouch can be kept in the optimum range of 0.3 to 5%, and at the same time, the ethylene gas concentration in the pouch is kept low. It is effective for keeping green color of plums and preventing off-flavors. Also, there is no softening or trouble after opening.

[0027]

[Table 2]

[0028]

[Table 3]

[0029]

Example 2 Polymethylpentene (MX-02 manufactured by Mitsui Petrochemical Industry Co., Ltd.) was prepared using a conventionally known T-die method.
1) Non-woven fabric (Unitika Elves S0303WDO)
Extruded with a thickness of 40 μm on 30 g / m ² ) to obtain a laminated film used for the folded part of the present invention. Next, a laminated film used for the body of the present invention having the following specifications was obtained using a conventionally known T-die method.

A gusset bag was formed by using 15 μm of nylon and the above laminated film to obtain a gusset for keeping the freshness of blue turtle of the present invention having a folded part width of 270 mm, a body part width of 400 and a height of 600 mm (folding). 0.32m ² part area, 0.48 body area
m ^2, the total pouch area 0.80m ^2).

[0031]

[Comparative Example 4] A gusset having a gusset width of 270 mm and a body width of 400 x 600 mm was formed by using polyethylene having a thickness of 30 µm (Mirason 16P manufactured by Mitsui Petrochemical Industries, Ltd.) in the same manner as in Example 2. I got a bag.

[0032]

Test Example 3 Table 4 shows the results of measuring the oxygen permeability of the gusset bags of Example 2 and Comparative Example 4 per pouch at 23 ° C. As evident from this result,
The gusset bag of the present invention has a higher oxygen permeability than Comparative Example 4.

[0033]

[Table 4]

[0034]

Test Example 4 Using the gusset bags of the example and the comparative example of capture, 10 kg of blue plum was hermetically sealed and stored at 22 ° C. for 3 days, and then the internal gas composition and quality change were examined. In addition, as a control, unpackaged and stored at 22 ° C. for 3 days in Example 2,
The freshness keeping effect was compared with Comparative Example 4. The results are shown in Tables 5 and 6.

As is apparent from Tables 5 and 6, the use of the gusset bag for keeping freshness of blue plum according to the present invention makes it possible to keep the inside of the pouch at an optimal internal gas composition, and to maintain the green color of blue plum. It is effective in preventing off-flavors.

[0036]

[Table 5]

[0037]

[Table 6]

[0038]

According to the present invention, since the present invention is constructed as described above, the oxygen permeability at 23 ° C. per pouch is 1
Blue plums are sealed and packaged in a pouch of 0,000-100,000cc / 24hr · atm, and an ethylene remover is enclosed and stored, so that the inside of the packaging bag is kept at a low oxygen and low carbon dioxide concentration, and at the same time it is generated from fruits. Ethylene gas is removed.
The freshness retention period of blue plum, which has lost its commercial properties due to yellowing in 4 days, can be greatly extended, and is extremely useful in industry.

[Brief description of the drawings]

FIG. 1 is a perspective view of a gusset bag for keeping freshness of blue plum according to the present invention.

[Explanation of symbols]

 1 ... folded part, 2 ... trunk

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI // B32B 27/12 B32B 27/12 B65D 85/00 Z 85/50 Z (56) References JP-A-54-70457 (JP, A) JP-A-3-198737 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A23B ⁷ /00-7/152 A23L 3/3427 B65D 81/24-81/26

Claims (6)

(57) [Claims] 1. The pouch comprises a folded part (1) and a body part (2).
Folded part (1) can be heat-sealed at low temperature
It consists of a sheet in which a thermoplastic resin is laminated on a non-woven fabric.
Oxygen permeability at 3 ° C is 10,000-100,00 per pouch
A method for preserving the freshness of blue plum, comprising packaging blue plum in a pouch of 0 cc / 24 hr · atm, enclosing an ethylene removing agent in the pouch, and storing at room temperature. Wherein the total surface of the pouch, blue plum method of freshness according to claim 1, wherein the formed sheet obtained by laminating a thermoplastic resin on a heat-sealable nonwoven fabric at low temperatures. 3. The method according to claim 1, wherein the thermoplastic resin is polymethylpentene. 4. The method according to claim 1, wherein the ethylene removing agent is a bromine-adsorbing agent.
The method for maintaining freshness of blue ume according to claim 1, 2 or 3, which is a carbonaceous molecular sieve having micropores of up to 6%. 5. The method for maintaining freshness of blue plum according to claim 1, wherein the weight of the green plum to be packaged is 10 kg. 6. is composed of folding section (1) and the barrel (2) consists folding unit (1) are laminated polymethylpentene onto the heat-sealable nonwoven fabric at low temperature sheet 23
Oxygen permeability per pouch at ℃ 10,000 ~ 100,00
A gusset bag for keeping freshness of blue plum, characterized by being 0cc / 24hr · atm.